Thermal Elastohydrodynamic Lubrication Analysis of High-Speed and Light-Load Rolling Bearing with Double Rings Rotation

Abstract

In order to reveal the lubrication performance of the rolling bearing under the condition of double rings s rotation, a novel rolling bearing contact lubrication analysis model for double rings rotation with an improved load distribution is developed. The effects of different parameters, such as the load, slip and speed, on the distribution of the temperature, pressure and film thickness of the rolling bearing are studied. The results show that the change rate of speed in double rings homonymous rotation is greater than that for single ring rotation and double rings reverse rotation on the inner and outer rings. Thus, the temperature change is higher for the former rotation than the latter two rotations. The oil film thickness for double rings reverse rotation is less than that for the other two types of rotations. The pressure distribution for the three types of rotations is more complex than the behaviour of the contact velocity and film. For variable speed, the temperature of the reverse rotation increases with the inner ring speed, which decreases as the outer ring speed increases. The temperature increases with the inner ring speed, which increases with the outer ring speed. The temperature of the double rings homonymous rotation or the reverse rotation increases with the load and slip. This manuscript can serve as a reference for research on the life and reliability of helicopter engine bearings under various rotation conditions.

Influential Factors in the Loading of the Axial Bearing of the Slewing Platform Drive in Hydraulic Excavators

“…The research related to the rotation drive mechanism of the excavator platform mainly deals with: a) loading of large-diameter axial bearings and fatigue analysis of bearing [2][3][4][5][6], b) loading of the track for rolling elements of axial bearings [7][8][9][10], c) examination of influential factors for determining bearing load capacity diagrams, which are used, in comparison with equivalent loads, to carry out the selection of axial bearings [11][12][13][14][15], d) loading of the screw joint of axial bearings [16][17][18][19][20], e) hybrid drive mechanisms of the excavator slewing platform [21][22][23][24][25], and f) recovery of the energy generated when the platform stops turning [26][27][28][29][30]. Hydraulic excavators are characterized by a large number of different size models.…”